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BUSINESS SEGMENTS - Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment information [Line Items]
Property, plant and equipment, net	$ 57,882us-gaap_PropertyPlantAndEquipmentNet	$ 60,546us-gaap_PropertyPlantAndEquipmentNet	$ 59,476us-gaap_PropertyPlantAndEquipmentNet	$ 60,215us-gaap_PropertyPlantAndEquipmentNet	$ 59,248us-gaap_PropertyPlantAndEquipmentNet	$ 55,641us-gaap_PropertyPlantAndEquipmentNet	$ 52,235us-gaap_PropertyPlantAndEquipmentNet	$ 60,546us-gaap_PropertyPlantAndEquipmentNet	$ 55,641us-gaap_PropertyPlantAndEquipmentNet	$ 57,882us-gaap_PropertyPlantAndEquipmentNet	$ 59,248us-gaap_PropertyPlantAndEquipmentNet	$ 63,835us-gaap_PropertyPlantAndEquipmentNet	$ 60,215us-gaap_PropertyPlantAndEquipmentNet
Net sales	51,886us-gaap_SalesRevenueNet	51,911us-gaap_SalesRevenueNet	46,769us-gaap_SalesRevenueNet	49,339us-gaap_SalesRevenueNet	52,331us-gaap_SalesRevenueNet	55,554us-gaap_SalesRevenueNet	44,836us-gaap_SalesRevenueNet	98,680us-gaap_SalesRevenueNet	100,390us-gaap_SalesRevenueNet	150,566us-gaap_SalesRevenueNet	152,720us-gaap_SalesRevenueNet	202,561us-gaap_SalesRevenueNet	202,060us-gaap_SalesRevenueNet	192,737us-gaap_SalesRevenueNet
United States [Member]
Segment information [Line Items]
Property, plant and equipment, net				28,501								26,291	28,501
Net sales												91,009	88,532	71,155
Iraq [Member]
Segment information [Line Items]
Net sales												11,348	4,243	1,756
Russia [Member]
Segment information [Line Items]
Property, plant and equipment, net				10,152								9,556	10,152
Net sales												7,992	5,992	6,472
Germany [Member]
Segment information [Line Items]
Property, plant and equipment, net				12,703								21,210	12,703
Net sales												7,721	9,208	13,992
India [Member]
Segment information [Line Items]
Net sales												7,617	8,888	3,874
South Korea [Member]
Segment information [Line Items]
Net sales												7,362	11,642	9,469
France [Member]
Segment information [Line Items]
Property, plant and equipment, net				5,801								4,440	5,801
Net sales												5,478	3,756	6,249
China [Member]
Segment information [Line Items]
Net sales												1,800	606	7,986
Canada [Member]
Segment information [Line Items]
Property, plant and equipment, net				2,230								1,655	2,230
Net sales												23,532	18,142	21,083
Kazakhstan [Member]
Segment information [Line Items]
Property, plant and equipment, net				438								461	438
Net sales												1,551	2,513	2,359
Rest of the world [Member]
Segment information [Line Items]
Property, plant and equipment, net				390								222	390
Net sales												$ 37,151	$ 48,538	$ 48,342